56. Is cryonics a viable strategy for longevity?

Cryonics is best viewed as a time-bridge: it aims not to extend life biologically today, but to preserve enough physical information in the brain (and, secondarily, the body) that future technologies could restore function or reconstruct the person. From this perspective, it is a viable strategy. However, at present, this is challenging: long-term vitrification damages tissues, no mammal has been revived after true cryopreservation with intact brain function, and the key unknown is whether the fine-grained causal organization needed for memory and identity can survive the process. However, some animals (insects, fishes, frogs) can naturally survive freezing or extreme cold, yet transferring such traits to mammals remains highly speculative. In the deleteriome framework, cryonics postpones further burden accumulation by halting metabolism, but it replaces biological risk with information-preservation risk (fracture, ice, toxicity, ischemia, etc.). Cryonics also raises ethical and legal questions (consent, stewardship, definition of death, rights of revived persons).